Cactus Code Thorn Maximal
Author(s)    : unknown
Maintainer(s): Cactus team
Licence      : LGPL
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1. Purpose

This thorn setus up the maximal slicing equation (dtrK/dt=0):

__2                  ij         i
\/ alpha = alpha K  K    +  beta  d trK  +  matter terms
                  ij               i

The laplacian operator is the full non-linear one, but it most be
supplied by the elliptic solver.  This thorn only fills in the right
hand side of the equation and then calls an elliptic solver.

The equation is rewritten as:

__2
\/  alpha  +  M alpha  =  N 


and the thorn fills in the values of M and N.  Notice that if K=0,
then we can safely set N=0 from the equation above.  This is normally
assumed to be true unless otherwise specified.